BMW E39 M5 Coolant Expansion Overflow Reservoir Tank Bottle S62 V8 2229114

BMW E39 M5 Coolant Expansion Overflow Reservoir Tank Bottle is an original cooling system component designed for the S62 V8 engine in the M5 model. Thanks to its factory design, it ensures proper circulation and coolant volume compensation, which directly impacts the stable operating temperature of the engine. This used OEM component is a sensible choice when servicing the demanding, high-revving engine of the BMW E39 M5.

Specifications and technical data

• SKU: 2229114
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2229114
• Substitutable numbers: 2229114, 17112229114
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a cooling system component dedicated to the BMW E39 M5 with the S62 V8 engine. It is responsible for safely managing excess coolant as temperatures rise and returning it to the circuit once cooled. A properly selected tank helps maintain stable system pressure, reduces the risk of overheating, and supports uniform heat dissipation from the engine.

Thanks to a design consistent with BMW factory specifications, the tank works with original cooling system accessories, facilitating installation and subsequent operation. This is particularly important in the high-performance S62 engine, where thermal stability is crucial for component durability.

Construction and fitment for the BMW E39 M5

As a part from the Expansion Tanks category, this component has been designed for specific mounting points and hose routing in the BMW E39 M5 engine bay. This ensures proper fitment with factory brackets, hoses, and the cap, without the need for modifications or adapters.

Its original BMW origin helps maintain compliance with the vehicle's factory specifications, which is important both from the perspective of reliability and future service diagnostics. A used expansion tank can be an effective alternative to new aftermarket replacements, especially for cars maintained in a condition as close to stock as possible.

Condition, verification, and service application

The item is offered as a used OEM component, allowing for an economical repair of the cooling system while maintaining the original design. This type of part is suitable for replacing a damaged, leaking, or degraded tank, which can cause coolant loss, air pockets in the system, or fluctuations in engine operating temperature.

Selecting a tank compatible with the M5 S62 V8 version is particularly important due to the specific thermal loads of this engine. A properly matched component helps reduce the risk of failures resulting from overheating, such as gasket damage, deformation of plastic parts, or accelerated wear of auxiliary components.

Benefits of using an original expansion tank

• Factory fitment for the BMW E39 M5 with the S62 V8 engine.
• Compatibility with the original cooling system and accessories.
• Support for stable engine operating temperature and proper system bleeding.
• A sensible service solution for repairs of the demanding V8 engine.

For owners who want to keep their car in a configuration close to factory standards, using an original expansion tank is a practical way to maintain structural consistency and predictable cooling system behavior.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other items from the same group, such as additional tanks, mounting elements, or related cooling system components, check out the available parts in the BMW Expansion Tanks category.